<template>
  <div>
        <!-- 面包屑导航区 -->
<el-breadcrumb separator-class="el-icon-arrow-right">
  <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
  <el-breadcrumb-item>商品管理</el-breadcrumb-item>
  <el-breadcrumb-item>分类参数</el-breadcrumb-item>
</el-breadcrumb>

<!-- 卡片区域 -->
<el-card>
  <!-- 警告区域 -->
    <el-alert
    title="注意:只允许为第三级分类设置相关参数!"
    type="warning"
    :closable='false'
    show-icon>
  </el-alert>

  <!-- 选择商品分类区域 -->
  <el-row class="cat_opt">
    <el-col>
      <span>选择商品分类:</span>
      <!-- 选择商品分类区域 -->
      <el-cascader
    v-model="selectedCateKeys"
    :options="catelist"
    @change="handleChange"
    :props="{ expandTrigger: 'hover',value:'cat_id',label:'cat_name',children:'children'}"></el-cascader>
    </el-col>
  </el-row>

  <!-- tab页签区 -->
  <el-tabs v-model="activeName" @tab-click="handleTabClick">
    <!-- 添加动态参数面板 -->
    <el-tab-pane label="动态参数" name="many">
      <!-- 添加参数的按钮 -->
      <el-button type='primary' size="mini" :disabled='isBtnDisabled'
      @click="addDialogVisible=true">添加参数</el-button>
      <!-- 添加动态参数表格 -->
      <el-table :data="manyTableData" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <!-- 循环渲染tag标签 -->
              <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i"
              closable @close='handleClose(i,scope.row)'>{{item}}</el-tag>
              <!-- 输入文本框 -->
              <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>     
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
        <el-table-column label="操作">
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini"
            @click='showEditDialog(scope.row.attr_id)'>编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini"
            @click="removeParams(scope.row.attr_id)">删除</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-tab-pane>
    <!-- 添加静态属性面板 -->
    <el-tab-pane label="静态属性" name="only">
      <!-- 添加属性的按钮 -->
      <el-button type='primary' size="mini" :disabled='isBtnDisabled'
      @click="addDialogVisible=true">添加属性</el-button>
      <!-- 添加静态参数表格 -->
      <el-table :data="onlyTableData" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <!-- 循环渲染tag标签 -->
              <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i"
              closable @close='handleClose(i,scope.row)'>{{item}}</el-tag>
              <!-- 输入文本框 -->
              <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>     
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
        <el-table-column label="操作">
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini"
            @click='showEditDialog(scope.row.attr_id)'>编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini"
            @click="removeParams(scope.row.attr_id)">删除</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-tab-pane>
  </el-tabs>
</el-card>

<!-- 添加参数的对话框 -->
<el-dialog
  :title="'添加'+titleText"
  :visible.sync="addDialogVisible"
  width="50%"
  @close='addDialogClosed'>
  <!-- 添加参数的对话框 -->
  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>

<!-- 修改参数对话框 -->
<el-dialog
  :title="'修改'+titleText"
  :visible.sync="editDialogVisible"
  width="50%"
  @close='editDialogClosed'>
  <!-- 添加参数的对话框 -->
  <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
     catelist:[] ,
    //  级联选择器双向绑定的数组
     selectedCateKeys:[],
    //  被激活的页签名称
     activeName:'many',
    //  动态参数数据
     manyTableData:[],
    //  静态参数数据
     onlyTableData:[],
    //  对话框显示与隐藏
    addDialogVisible:false,
    // 添加参数表单数据对象
    addForm:{
      attr_name:''
    },
    // 添加表单的验证规则对象
    addFormRules:{
      attr_name:[{required:true,message:'请输入参数名称',trigger:'blur'}]
    },
    // 编辑对话框显示隐藏
    editDialogVisible:false,
    // 编辑表单数据对象
    editForm:{},
    // 编辑表单验证规则对象
    editFormRules:{
      attr_name:[{required:true,message:'请输入参数名称',trigger:'blur'}]
    },
    }
  },
  created(){
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类列表
    async getCateList(){
     const {data:res}= await this.$http.get('categories')
     if(res.meta.status !==200){return this.$message.error('获取商品分类列表失败')}
     this.catelist=res.data
     console.log(this.catelist);
    },
    // 级联选择器选中框变化触发函数
    handleChange(){
      this.getParamsData()
    },
    // tab页签点击事件处理函数
    handleTabClick(){
      this.getParamsData()
      console.log(this.activeName);
    },
    // 获取参数的列表数据
    async getParamsData(){
      if(this.selectedCateKeys.length !==3){
        this.selectedCateKeys = [] 
        this.manyTableData=[]
        this.onlyTableData=[]
        return
        }
        console.log(this.selectedCateKeys);
        const {data:res}= await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
        if(res.meta.status !==200){return this.$message.error('获取参数列表失败')}
        res.data.forEach(item=>{
          item.attr_vals=item.attr_vals?item.attr_vals.split(' '):[]
          // 控制文本框的显示与隐藏
          item.inputVisible=false
          item.inputValue=''
        })
          console.log(res.data);
        if(this.activeName==='many'){
          this.manyTableData=res.data
        }else{
          this.onlyTableData=res.data
        }
    },
    // 监听添加对话框关闭事件
    addDialogClosed(){
      this.$refs.addFormRef.resetFields()
    },
    // 监听对话框确认事件,点击按钮,添加参数
    addParams(){
      this.$refs.addFormRef.validate(async value=>{
        if(!value)return
        const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
          attr_name:this.addForm.attr_name,
          attr_sel:this.activeName
        })
        if(res.meta.status !==201){return this.$message.error('添加失败')}
        this.$message.success('添加成功')
        this.addDialogVisible=false
        this.getParamsData()
      })
    },
    // 点击按钮展示修改对话框
    async showEditDialog(attr_id){
      // 查询当前参数的信息
      const{data:res} =await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params:{
        attr_sel:this.activeName
      }})
      if(res.meta.status !==200){return this.$message.error('查询参数失败')}
      this.editForm=res.data
      this.editDialogVisible=true
    },
    // 重置编辑表单
    editDialogClosed(){
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮,编辑修改参数
    editParams(){
      this.$refs.editFormRef.validate(async valid=>{
        if(!valid)return
        const{data:res} =await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{attr_name:this.editForm.attr_name,attr_sel:this.activeName})
         if(res.meta.status !==200){return this.$message.error('编辑参数失败')}
         this.$message.success('修改参数成功')
         this.getParamsData()
         this.editDialogVisible=false
      })
    },
    // 根据id删除对应的参数项
    async removeParams(attr_id){
      const confirmResult= await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err=>err)
      // 用户取消了操作
      if(confirmResult !== 'confirm'){return this.$message.info('取消了删除')}
      // 删除业务逻辑
      const {data:res}= await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      if(res.meta.status !==200){return this.$message.error('删除失败')}
      this.$message.success('删除成功')
      this.getParamsData()
    },
           // 发起请求保存结果
    async saveAttrVals(row){
      const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
        attr_name:row.attr_name,
        attr_sel:row.attr_sel,
        attr_vals:row.attr_vals.join(' ') 
      })
       if(res.meta.status !==200){return this.$message.error('修改失败')}
         this.$message.success('修改成功')
    },

    // 文本框失去焦点,按下enter触发事件
    handleInputConfirm(row){
      if(row.inputValue.trim().length===0){
        row.inputValue=''
        row.inputVisible=false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue=''
      row.inputVisible=false
      this.saveAttrVals(row)
    },
    // 显示文本输入框
    showInput(row){
      row.inputVisible=true
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 删除标签
    handleClose(i,row){
      row.attr_vals.splice(i,1)
      this.saveAttrVals(row)
    },
  },
  computed:{
    // 按钮需要被禁用返回true,否则返回false
    isBtnDisabled(){
      if(this.selectedCateKeys.length !==3){return true}
      return false
    },
    // 当前选中的三级id
    cateId(){
      if(this.selectedCateKeys.length===3) {return this.selectedCateKeys[2]}
      return null
    },
    // 动态计算标题的文本
    titleText(){
      if(this.activeName==='many'){
        return '动态参数'
      }
      return '静态属性'
    },
  }
}
</script>

<style lang='less' scoped>
.cat_opt{
  margin: 15px 0;
}
.el-tag{
  margin: 5px;
}
.input-new-tag{
  width: 120px;
}
</style>